Borislav Petkov wrote:
Right, this was too easy to be true. I now did:
qemu -hda /dev/hda -snapshot
and booted from the hd using the installed grub and the same kernel and it
_didn't_ boot showing again "no setup signature found... "
Okay, so it's an algorithmic problem. This is quite important to know.
Is /boot a separate partition on your disk by any chance? Either way,
this means we can use qemu to debug this, which will make it a lot easier.
This is what I'd like you to do next:
- run qemu in one window with the -S -s options.
- in another window, do:
gdb
target remote localhost:1234
set architecture i8086
disp/i ($cs << 4)+$eip
br *0x10200
br *0x20200
br *0x30200
br *0x40200
br *0x50200
br *0x60200
br *0x70200
br *0x80200
br *0x90200
c
# ... hopefully you're now stopped at a jump instruction
p/x $ds
# Hopefully this is showing, say, 0x9000 if you're stopped
# at 0x90200
# Where X is the first digit of the address stopped at:
dump memory setup.dump 0xX0000 0xX8000
Please send me setup.dump plus your vmlinuz file.
Thanks,
-hpa
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